Mystery Bag is a special type of crate filled with many cosmetics, including seasonal cosmetics. By spending 30 Oranges, the player can receive a crate-exclusive cosmetic, or a seasonal cosmetic from a previous event, without needing to wait for a future event for a chance to receive the item. However, the player has a high chance of just receiving 15 Oranges instead of a cosmetic, essentially wasting 15 Oranges.
The Mystery Bag has a limited range of contents, as certain unique and noncosmetic items are not added to it. For instance, the bag does not contain boards, costumes, or any unlocks that can be earned from a campaign. If the player has unlocked all items (except Oranges) in the Mystery Bag's reward pool, the bag will no longer be purchasable. However, if new items are added to the bag at a later date, it will become available for purchase again.
The Mystery Bag only contains a small selection of the game's seasonal cosmetics. Since the end of the original Scramble!! for an Xmas Miracle! event, no new cosmetics have been added to the Mystery Bag, other than Sunglasses and the Christmas Outfit color (which have been consistently added to the Mystery Bag for new characters). For most seasonal unlocks since then, the Mystery Bag has been succeeded by other systems of returning unlocks, namely rerun events and retired events.
If all items in a category have already been unlocked, the odds will carry over to the category above it (for example, if all Sunglasses are unlocked, Christmas Outfits have a 10% chance of being unlocked), with Oranges counting as being above Rad Poppo.
On average, if you already have Rad Poppo but still need items from every other category, you will pay ~54.5 Oranges per item.
Mystery Bag-Exclusive Event Collectibles
While no cosmetics have ever been exclusive to the Mystery Bag, some event cosmetics have not been made available in events for a significant period of time. As such, they are unlikely to be obtainable in future events, making the Mystery Bag the only source for these items.